George Hooper - Tuning and Sailing a 4.9 Cat
George is the 2009 4.9 Cat Rig Champion
There are a number of very good articles posted on the Taipan web site which cover a range of tuning, boat handling and setup ideas. I have used these articles as well as lots of advice from Greg Goodall, Glenn Ashby, Dennis Baker and Tim Kirkham. So I will try to cover newer ideas on the new big head as well as how we (PMYC) collectively worked together to improve our knowledge and speed. I strongly suggest reading the existing articles first. Lastly, my houghts are based on the shape of the Ashby sail I use, which appears on the flat side. This is arguably a general trend at the
moment for all bighead sails, from 18' skiffs to America's Cup, more
efficient, less drag etc. I weigh about 84kg, so you will need to make allowances for weight differences.
I have tried different rakes in different breezes and found it
makes little difference. Mine is pretty much always between the front of
the hatch cover and the rear of the beam. Maybe a hole down on the forestay
in very light breeze, although every time I remember to do that, the breeze
comes in and I end up hanging off the back.
Spreader Rake (700 mm max wire width) - based on the belief that I
think bigheads work better with a stiffer more upright mast, I have moved
my spreaders forward from positions stated in web site articles. Mine are
set between 33 - 45mm. I also changed to the "finger adjustable" proctor
spreaders. This means from 33mm to 45mm is 3 turns using your fingers. This
made mucking about and testing alot easier. We could go out tuning, get one
boat to make a change and test the difference immediately. This was a big
help to all of us, especially with weight differences and the way we sailed
individually. There is probably a little more propensity to get over
powered with less prebend, so find "11" on the downhaul.
Spreader tension - mine is set at about 32 on the newer loos gauge.
Again we buggerised around with different tensions, but due to alot of 3
boat testing we found that's where it was ok in most conditions. If someone
invented a "finger adjustable" tensioner, then I guess we would have
another tilt at it. I would set and forget around that mark, with any minor
adjustment for weight. Looser if you are a little porky, and tighter if you
Again it does not seem to matter very much. We don't
have a jib, so don't need to worry about forestay sag. I pull down on a
trap wire firmly (60-70 kgs) to tighten the sidestays. However they always
seem a bit looser than most. Just stick to the recommendations in the
Platform, rudders etc
I use the published articles for the hull and foil setup. I don't
think there is a significant difference between rudder shapes or
materials. New carbon, anti cavitating rudders are nice to have, but plenty
of boats go very fast with the standard ones. It is more important to
ensure they are aligned and you have only a small amount of helm (if any).
The existing articles are all still pretty accurate except for a minor
change for the big heads. I think they need more sheet tension generally. I
have 9:1 on my main, ratchet off the tramp, so you lose a little purchase
due to flex. This also means that sometimes it feels like you are over
sheeting, and I think you can (maybe not easy above 15kts). So you have to
go for the downhaul a little earlier, and work the two in combination.
The rotation, I think is also in a little more and earlier than in the
articles. But maybe that's because we had flat water at the Nationals and I
have a slightly flatter sail. As soon as you have any waves it seems easier
to stall the bigheads. So just use the advice in the existing articles. The
upshot is the bigheads need to be sailed more attentively, there is less
option for "set and forget". I guess that's the trade off between
efficient, low drag sails being easier to stall, falling leach, not enough
power etc, etc. That said, I think Greg sails with a slightly fuller sail
which may have a bigger more forgiving wind band. He still seems to work it
like nobody's business though. I have an extra set of light, top 4 battens.
These seem to improve light wind downwind performance. And again, if the
breeze comes in, it feels as though it stalls more quickly. (probably
psychological). If you are light, and feel overpowered early, try an extra
set of stiff top battens.
I had good all round speed at the Nationals mainly due to sailing with a
large fleet of keen Taipan sailors at PMYC. We all worked together, shared
ideas and gave it all when we had tuning sessions. Greg Goodall's advice on
rigs, sails, setup, as well as 2 boat tuning was invaluable. The fact that
he races at our club is a bonus. In fact, that is the best piece of advice
I can offer - if you can work as a fleet and spend time on the water tuning
as well as racing you will improve much faster than doing it on your own.
Apart from improving faster, it's alot more fun.
Lastly, since we enjoy sailing a truly one design boat, the most effective
way of improving in a regatta, is having a plan. How to approach the
starts, where would you like to be on the course tactically, keep your head
out of the boat etc, etc. As well as basics like don't get caught up in
duals in a big fleet, don't end up in the "corners" of the track and
overlay marks. Try reading Dave Dellenbaugh if you are interested in race
tactics. It's also good to know the racing rules. Not because you want to
look like a hero in the protest room, the knowledge helps avoid the protest
room (and collisions).